In the aftermath of the deadly school shooting in Parkland, Fla., the American people are mad.

Mad at the FBI, which received a detailed and specific warning of the shooting but never followed up. Mad at the Broward County Sheriff’s Office, which visited the attacker’s home 23 times before the shooting and waited outside for several minutes before running into the high school. And, of course, they’re mad at the killer.​Progressive activists and many in the news media have rather different priorities. Their ire is focused squarely on a group that wasn’t tipped off, wasn’t a first responder, and had no affiliation with the attacker. Namely, the National Rifle Association.